Process of vulcanization of natural or artificial rubert or rubberlike substances



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ihT -ilii DE LUNG, 0E WASEHTG-TQN, DISETZLIG')? Q33 CUL'JTBXA,

WATSON, (3E AUBURN,

EIAZNE.

LIKE $UB$TANGE$ fife brewing.

merits in Erocesses of vulcanization of Naturel or Artificial Rubber 0: Rubber-like Sub sauces, oi which the following is a specification.

@ur'invention relates to the art of vull'c-anizing natural or artificial rubber or rubber-dike substances and has for its object to obtain the desired vulcanization in a much shorter time than is possible when pursuing ihe ordinary methods of vulcanizing now in rogue; and at the same time to obtain a Well vulcanized product. According to our invention there is added to the rubber or other substance to befiyuicanized a suitable quantityof dichloranilin, which may be any of the isomeric forms of this substance, or a mixture of any of these forms.

In practising our inyention dichloranilin in proportion of .5 to 5 per cent. by Weight is added to the n'iixture to be vulcanized, either along with the sulfur, or therefrom and with or'without any other substances that may be used in compounding rubber products, and is thoroughly mixed through such substance in any ell linown manner, and by means of any approved apparatus. l he mixture being completed, and thorough, therubber is vul canized by subjecting it to the desired degree of heat according to well-known procedure. A well vulcanized product is the result of the process, and this we obtain in a much shorter time than is obtained by the ordinary methods of vulcanizing, the dichlorauilin servihg as an accelerating sub stance to hasten the vulcanizing process and the union between the sulfur and rubber or rubber-like substance. The proportion of dichioranilin employed will be varied to suit the nature of the vulcanized product to be prcduced. the length of time which is to be taken in completin the vulcanizing operation, etc. is a general proposition the larger the proportion of dichloranilin used the more rapid the vulcanizing process. Likewise in nreducing' rd rubber a larger -ortioe 0'5: the dichlorunilin will be used.

Snecificetioz; oi Letters Retest.

Application filed July 20, 1926. Serial No. 3537,5201.

Our invention is unique in thet we are the first, as We believe, to utilize dichloranilins as accelerating agents in the vulcanization of natural or artificial rubber or rubber like substances. Among the advantages incidenl; to the use of these substances are: Dichloz'enilin in its different i ormor modifications is manufactured from a icy-product of certain dyeanaking processes and wherefore may be secured at low cost there is now but small demand "for this substance.

Again, the degree of heat requiredto vein-- tilize dichloranilin, in of its forms, so much above the degree of heat employed in vulcanizing rubber and rubberdilre substances that there is very iittle vaporization of this substance during the vulcanizing process, and hence the amount of dichloran ilin vaporsgiven of? is very small. Dicbloranilin may therefore be safely used as an accelerating agent in the vulcenizing of rubher, whereas many other substances thet have been suggested for use accelerating agents are highly objectionable on. account of the poisonous and unpieesant. vapors that are given off, owing; to therelatively low temperature of vaporization.

Haring described our invention what we claim is i. In the art of vulcanizingr rubber or rubl'ier-like substances the addition oi (ii bhloranilin to the substance to be vulcanized prior to the vulcanizing step.

2. In the art of vulceni 1' g" rubber or rubber-like substances, subjecting a mixture of the substance to be vulcanized cndsulfur to a vuleanizing heat in 'th presence of dichlorauilin.

3. The process of accelerating the vulcanization of natural or artificiai rubber or rubber-like substances, "which consists in thoroughly mixing with the substance to be vulcanized sulfur and dichloranilin and then 

